Radio apparatus



Aug. 26, 1930. T' J SCQFIELD 1,774,243

RADIO APPARATUS Filed Dec. 21, 1926 1/ pl g! i 5 I '4 30 A TTORNEYS 'a tented Aug. 26, 1930 rrmononn JOHNSON wI'r ImG'roN COMPANY, 01

SCOFIELD,'0F JACKSON, MICHIGAN, ASSIGNOR TO THE SPARKS- JACKSON, MICHIGAN,

A CORPORATION on 0310 RADIO APPARATUS Application filed December 21,

This invention relates to certain new and useful improvements in radio apparatus.

More especially the invention pertains to an improved structure for simultaneously operating a plurality of dials for variable apparatus, such as condensers, rheostats, or the like, and to the particular structure by which such simultaneous operation is efiected with a minimum chance of breaking, injuring or varying the apparatus in a manner to prevent the necessary coordination of the parts.

Other objects and advantages relate to the details of the structure and the parts thereof, all as will more fully appear from the following description taken in connection with the accompanying drawings, in which: Figure 1 is an elevation of a portion of the front panel of a radio-receiving apparatus. Figure 2 is a View of the structure of Figure 1 taken from the rear.

Figure 3 is a section on line 3-3, Figure 2. Figure 4 is a section on line H, Figure 2. The apparatus as shown comprises two properly calibrated dials -1- and -2 respectively adapted for rotary movement with their calibrated portions moving past respective openings 3 and 4- on the front anel 5- of a radio-receiving apparatus. Each of these dials is supported in a simi- D lar manner, being clamped between a metallic disk -6- preferably of circular form, and a substantially flat circular base -7 of a drum -8-. The disk 6 is secured to the base --7 of the drum by projecting tongues 9- cut out from the disk throug openings in the drum, and then bending the ends 1() of the tongues into contact with the rear face of the base 7 In this illustration three tongues are shown cure the disk to the drum. A

The structure so far described" is held in proper position with respect to the panel 5 and the respective openings -3- 01' -4, as for instance by mounting the same upon a condenser shaft 1l-, the condenser being rigidly secured in proper position, and for this purpose a bushing -12' is provided which extends through a central opening in the base 7, and is rigidly secured thereto by flange -13 which lies against the rear h rounded guide -27- and the other end of which se-' 1926. Serial No. 156,133.

face of the base -7-, and a plurality of welded or pressed out parts 14.- which engage the front face of the'base -7- to form a rigid andpositive engagement, whereby rotation of base -7 will rotate the shaft 11- which may be secured to the bushing 12- in'any suitable manner, as by set screw 16. s

In order to operate two or more of these dials, and their associated parts from a single knob or handle, the drum 8- is preferably formed ,with two rims -17- and -18 preferably of different diameter, the forward rim 17 being in this illustration of less diameter.

This rim of lesser diameter .isutilized only in connection with one of said drums 8- which is initially driven from the operating knob -20- through the medium of pulley -2land belt --22. This belt extends around the pulley 21- and substantially the entire dlstance around the rim .l7 which constitutes the driving pulley for the drum. As shown, one end of belt 22 is secured to the rim -17 by projecting its end through an opening in the rim 17 and forming the belt with a stop or knot 25 sufliciently large so that it will not pass through the opening in the rim. Ata point adjacent the opening through which the belt is projected and the knot or other stop is formed, the rim 17 is formed with a second opening 26, the cutaway portion of the metal being pressed inwardly to form a the belt -22 extends inwardly through opening 26- over the guide 27- and has its end connected to a spring 28-, the opposite endof the spring being connected to a hook or tongue -29- formed by cutting out and pressing in a portion of rim -17-.' i 'It will be obvious that by rotation of pulley 21 the drum 8 will be rotated, and in order to rotate a second drum simultaneously with and in coordination with the drum'upon which belt 22 is mounted, a belt or tape -30 which may preferably be formed of thin flexible flat sheet metal extends around the second drum 8-, which in this illlustration is associated with the dial 1 0 numbered 2- and also around the first drum 8 and has its ends overlapped and secured to the drum -8, as for instance by rivet 3l.

It will be apparent that when the overlapped riveted ends of the tape 30 arrive at the position shown in Figure 2, no further movement of the drum 8 in an anti-clock Wise direction (Figure 2) is possible Without breaking of some of the parts, and in order to relieve the drums and tape 30 of strain, the spring -28- will thereafter act to permit some movement of the adjacent end of belt 22 by expansion of the spring if the operating pulley 2l is thereafter rotated further in an anti-cloclr-Wise direction, Figure 2.

The structure described is found to be highly efficient and practical in producing asimuitaneous coordinated movement of tWo dials which are in this instance calibrated in ac cordance with the movement of variable apparatus, such as condensers, rheostats and the like, and altho have shown and described a specific structure as illustrative of a perhaps preferred embodiment of the invention, I do not desire to restrict myself to the details of the same, as various changes and modifications will be made within the scope of the appended claim.

1' claim:

fin apparatus or" the class described comprising a pair of dial structures, each of which includes a circular rim, a tape extending around the rims of said dial structures and having a rigid connection with one of said rims, one of said dial structures including a second rim, a belt extending around the second rim and having one end secured to the rim, and its other end projected through an opening in the rim and the spring securing the said other end to the dial structure.

In Witness whereof I have hereunto set my hand this 30th day of November, 1926.

THE-"ODQRE JGl-ENSQN SGQFIELD. 

